Multiple-input multiple-output ()
wireless uses different waveforms on typically two, but sometimes three
or more transmitting antennas inputting to the channel carrying radio
waves from Point A to Point B. Multiple antennas and radios (typically,
two or three) also are applied to the output of the radio channel at
the receiver, along with a lot of signal processing, which ideally
improves range and throughput compared with simpler or traditional
radio designs operating under similar conditions.
MIMO is sometimes referred to as spatial multiplexing, because it users
a third, spatial dimension - beyond frequency and time - as a carrier
for information. The multiplicative effect of properly designed MIMO
systems can be dramatic: As our tests show, the 100Mbps barrier
(application-layer throughput) in has been broken. Indeed, the upcoming standard will likely specify raw (physical layer) performance as high as 600Mbps via a 4-by-4 MIMO array.
MIMO is also likely to have an influence on so-called 4G cellular designs, but that's a different story.
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